Asphalt coated material



Patented Mar. 19, 1940 AsPnAL'r ooA'rEn MATERIAL Lester Kirschbl'aun, New York, N. Y., assignor to The Patent and Licensing Corporation, New York, N. Y., a corporation of Massachusetts No Drawing. Application December 30,1936, J Serial No. 118,254-

4 Claims. (01. 9168) This invention relates to composition building material and more'particularly to composition materials for roofing, siding and similar external coverings.

Construction material of this general type is commonly made from a base of felted fibrous material containing a low melting point asphalt impregnant and supplied with a coating layer of asphalt, of a higher melting point than that of the impregnant, on the face of the material to be exposed to the weather. Comminuted surfacing material such as crushed slate is usually applied to the coating layer and partially embedded therein It has been found that when building materials, of the type referred to above, have been in service over an extended period of time the asphaltic surface coating, which is exposed to the weather, tends to harden and become brittle.

This condition of the asphaltic coating manithe building material iscOntinued after the appearance of such checking and flaking of the surface coating a gradual deterioration of the entire material takes place due to the penetration of moisture through the more or less disintegrated surface coating to the-felt base.

The principal object of this invention .5 to prevent the undue hardening of an 'asphaltic coating exposed to weathering conditions by combining therewith a substance having the capability of retarding the hardening of the asphaltic coating. A

Basically, the invention comprises the incorporation in an asphaltic coating material of a finely divided substance containing an adsorbed mineral oil, the characters of the substance and adsorbed oil being such that the oil will difl'use in minute quantities within the body of the coating. It has been found that the presence of the minute quantities of the mineral oil diffused within the asphaltic, coating substantially retards the hardening of the asphalt coating and the consequent deterioration thereof. Substances containing adsorbed oils and from which the oils will diffuse within the body of a coating will hereinafter be generically designated by the -expression, oil diffusing substances.

The oil diffusing substances most suitable for use in the practice of this invention are, finely divided oil shales obtained from natural deposits, and spent fullers earth resulting from the refining of petroleum oil. Prepared substances may also be employed, such as activated charcoal and other finely divided cellular substances which have had the voids thereof filled with a ,mineral oil and which will slowly liberate their 5 incorporation taking place at any desired point in the handling of the coating asphalt. The asphalts conventionally employed as coatings for building materials have a melting point of from about 210 to 230 F. and these asphalts are, generally speaking, the ones with which my invention will be most commonly used. Asphalts of this typical grade are sufliciently liquid at temperatures from 350 to 475 F. to enable the same to be satisfactorily handled and applied in the manufacture of roofing or other construction, materials. Accordingly, the incorporation of the oil shale, spent fullers earth or other oil diffusing substance, within the coating material may readily be accomplished by heating the asphalt to a temperature of 350 to 475 F. so that it becomes freely liquid and then adding to the hot liquid asphalt the oil diffusing substance. Where finely divided fillers are to be incorporated in the coating asphalt for modifying its properties in accordance with well known practice, these finely divided fillers may first be incorporated in the hot molten asphalt and when these have been uniformly distributed through 85 the same, the oil diffusing substance may be added to'the mix and distributed therethrough.

Alternat vely, the oil diffusing substance may first be incorporated in the molten asphalt or the filler and oil diffusing substance may together 40 be added thereto. From the mixing device the composition may be suitably fed byp'umping or conducting it through pipes or other conduits to the coating rolls or other device by means of which it is applied to an asphalt saturated felt or other base. The practice of this method will result in a substantially uniform distribution of the finely divided oil diffusing substance within the body of the coating and hence diffusion of the oil will take place substantially uniformly throughout the coating. 7

In an alternativeembodiment of the present invention the oil diffusing substance may be distributed in a thin layer between two or more layers of the asphalt coating. For the purpose of obtaining this embodiment of the invention a layer of the asphalt coating may be applied to the impregnated felt base, a thin substantially single thickness layer of the finelydivided oil containing substance deposited thereon and finally a second and preferably thin layer of the asphalt coating may be spread over the previous layers. Care should be taken, to deposit the layer of the finely divided oil diflusing substance in such a way as to form as nearly as possible only a single layer of the particles of the substance so that the particles will be held and confined in place by the coating asphalt and to prevent the deposition of non-adherent layers of the particles over any substantial areas of the surface. It will be clear to those skilled in the art that since the particles of the oil diffusing substance are comparatively non-adherent to one another the interposition of what may in effect be described as two separate layers of particles might enable the two layers of the coating between which the particles are interposed to become separated or delaminated through the adhesion of each layer of the particles to its adjoining layer of asphalt coating, with substantially no adhesion between the adjoining layers of particles of the oil difiusing substance.

7 The practice of the alternative method provides a concentration of the oil containing substance in a substantially single thickness layer or stratums closely adjacent that portion of the asphaltic coating which is exposed to sunlight and other weathering conditions. The concentration of the oil containing substance as thus described will result in a maximum diffusion of the oil in the portion of the asphaltic coating most susceptible to the hardening effects of sunlight and other weathering conditions.

A layer of crushed slate or other comminuted surfacing material may be applied to the building material subsequent to the coating operation in accordance with conventional practice.

My invention has been described above as particularly applying to construction materials employing asphalt saturated felts as a base. It will be obvious to one skilled in the art, however, that its advantages will be obtained when used wherever a surface coating of asphalt is exposed to weather conditions irrespective oi. the

particular base material supporting the coating.

Having thus described an embodiment of my invention it is apparent that it is capable of change and modification without departing from its scope as defined by the appended claims.

What I claim is:

1.- A construction material, roofing or the like comprising a base of flexible fibrous felt saturated with a binder, said base carrying a coating comprising asphalt having an oil diffusing substance incorporated therein to retard hardening of the coating by the weather when exposed thereto for extended periods of time.

2. A construction material, roofing or the like, comprising a base of flexible fibrous felt, saturated with asphalt or the like, said base carrying an asphaltic coating material, the coating material having in a sub-surface layer thereof a finely divided oil difiusing substance to retard hardening of the coating by the weather when exposed thereto for extended periods of time.

3. A construction material,- roofing or the like, comprising a base of flexible fibrous felt, satu-' rated with asphalt or the like, said base carrying an asphaltic coating material having, a finely divided oil diffusing substance substantially uniformly distributed throughout the same .to retard hardening of the coating by the weather when exposed thereto for extended periods of time.

4. A construction material, roofing or the like, comprising a base of flexible fibrous feltsaturated with asphalt or the like, said base carrying an asphaltic coating material having a finely divided oil diffusing substance concentrated in a sub-surface layer thereof to retard hardening of the coating by the weather when exposed thereto for extendedperiods of time.

' LESTER KIRSCHBRAUN. 

